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Y301-880 Technical Manual ​

Y301-880

Contents ​

  1. Overview
  2. Default Settings
  3. Modbus Register Map
  4. Command Examples
  5. Parameter Configuration
  6. Automation Rules
  7. Troubleshooting

1. Overview ​

This manual describes the Modbus RTU communication commands for the Y301-880 I/O module.

ModelDIDOAIDescription
Y301-880880Eight inputs + eight relays

Frame format: [slave address][function code][data][CRC low][CRC high]

The examples below use slave address 0x01. Replace it with the actual device address in your application.

2. Default Settings ​

ParameterDefault
Slave address1
Baud rate9600 bps
Data bits8
ParityNone
Stop bits1

3. Modbus Register Map ​

3.1 Digital Input (DI) - Function Code 0x02 ​

ChannelAddress
DI10x0000
DI20x0001
DI30x0002
DI40x0003
DI50x0004
DI60x0005
DI70x0006
DI80x0007

Return value: 0 = inactive, 1 = active.

3.2 Digital Output (DO) - Function Code 0x01/0x05 ​

ChannelAddress
DO10x0000
DO20x0001
DO30x0002
DO40x0003
DO50x0004
DO60x0005
DO70x0006
DO80x0007

Write value: 0x0000 = open, 0xFF00 = closed.

3.3 Configuration Registers - Function Code 0x03/0x06 ​

AddressParameterRangeDefault
0x003ESlave address1-2551
0x0057Baud rate600-2304009600
0x0059Data bits8 or 98
0x005AStop bits1 or 21
0x005BParity0=None, 1=Odd, 2=Even0

4. Command Examples ​

4.1 Read Digital Inputs ​

OperationRequest (Hex)
Read DI101 02 00 00 00 01 B9 CA
Read DI201 02 00 01 00 01 E8 0A
Read DI301 02 00 02 00 01 18 0A
Read DI401 02 00 03 00 01 49 CA
Read DI501 02 00 04 00 01 F8 0B
Read DI601 02 00 05 00 01 A9 CB
Read DI701 02 00 06 00 01 59 CB
Read DI801 02 00 07 00 01 08 0B

4.2 Read Digital Output Status ​

OperationRequest (Hex)
Read DO101 01 00 00 00 01 FD CA
Read DO201 01 00 01 00 01 AC 0A
Read DO301 01 00 02 00 01 5C 0A
Read DO401 01 00 03 00 01 0D CA
Read DO501 01 00 04 00 01 BC 0B
Read DO601 01 00 05 00 01 ED CB
Read DO701 01 00 06 00 01 1D CB
Read DO801 01 00 07 00 01 4C 0B

4.3 Control Digital Outputs ​

OperationCommand
Open DO101 05 00 00 00 00 CD CA
Close DO101 05 00 00 FF 00 8C 3A
Open DO201 05 00 01 00 00 9C 0A
Close DO201 05 00 01 FF 00 DD FA
Open DO301 05 00 02 00 00 6C 0A
Close DO301 05 00 02 FF 00 2D FA
Open DO401 05 00 03 00 00 3D CA
Close DO401 05 00 03 FF 00 7C 3A
Open DO501 05 00 04 00 00 8C 0B
Close DO501 05 00 04 FF 00 CD FB
Open DO601 05 00 05 00 00 DD CB
Close DO601 05 00 05 FF 00 9C 3B
Open DO701 05 00 06 00 00 2D CB
Close DO701 05 00 06 FF 00 6C 3B
Open DO801 05 00 07 00 00 7C 0B
Close DO801 05 00 07 FF 00 3D FB

4.4 Quick Reference Table ​

OperationRequest (Hex)
Read DI101 02 00 00 00 01 B9 CA
Read DI201 02 00 01 00 01 E8 0A
Read DI301 02 00 02 00 01 18 0A
Read DI401 02 00 03 00 01 49 CA
Read DI501 02 00 04 00 01 F8 0B
Read DI601 02 00 05 00 01 A9 CB
Read DI701 02 00 06 00 01 59 CB
Read DI801 02 00 07 00 01 08 0B
Open DO101 05 00 00 00 00 CD CA
Close DO101 05 00 00 FF 00 8C 3A
Open DO201 05 00 01 00 00 9C 0A
Close DO201 05 00 01 FF 00 DD FA
Open DO301 05 00 02 00 00 6C 0A
Close DO301 05 00 02 FF 00 2D FA
Open DO401 05 00 03 00 00 3D CA
Close DO401 05 00 03 FF 00 7C 3A
Open DO501 05 00 04 00 00 8C 0B
Close DO501 05 00 04 FF 00 CD FB
Open DO601 05 00 05 00 00 DD CB
Close DO601 05 00 05 FF 00 9C 3B
Open DO701 05 00 06 00 00 2D CB
Close DO701 05 00 06 FF 00 6C 3B
Open DO801 05 00 07 00 00 7C 0B
Close DO801 05 00 07 FF 00 3D FB

5. Parameter Configuration ​

5.1 Change the Slave Address ​

Set the slave address to 5:

text
Request:  01 06 00 3E 00 05 E8 00
Response: 01 06 00 3E 00 05 E8 00

After the change, subsequent commands must use the new address.

5.2 Change the Baud Rate ​

Common baud-rate values:

Baud RateValue
96000x00002580
192000x00004B00
384000x00009600
1152000x0001C200

Power-cycle the device after changing the baud rate.

5.3 Restore Factory Defaults ​

Hold the Reload button for 3-15 seconds to restore:

  • Slave address -> 1
  • Baud rate -> 9600
  • All parameters -> factory defaults

6. Automation Rules ​

The Y301-880 supports DI -> DO automation. Up to 16 rules are supported, with 2 rules per DO.

6.1 Automation Register Map ​

Rules start at address 0x0080. Each rule uses 8 registers (16 bytes).

OffsetFieldDescription
+0ModeRule type (see table below)
+1Action0=open, 1=close, 2=toggle
+2DO indexTarget relay, starting from 1
+3Trigger indexSource DI, starting from 1
+4-5Parameter 1Mode-dependent, 32-bit
+6-7Parameter 2Mode-dependent, 32-bit

6.2 Rule Modes ​

ModeNameDescription
0DI followDO follows the DI state
1DI inverseDO is the inverse of the DI state
2PulseDO outputs a pulse for parameter1 ms when DI triggers
3Delayed ONDO closes parameter1 ms after DI closes
4Delayed OFFDO opens parameter1 ms after DI opens
5CycleDO toggles periodically, parameter1=ON time, parameter2=OFF time
9Daily scheduleExecute the action daily at the time specified by parameter1 (seconds since midnight)
11Button modeDO closes when the DI is pressed and opens when it is released
12WatchdogDO acts when the DI has no signal for parameter1 ms
13Logic combinationApply AND/OR/XOR logic across multiple DI channels

6.3 Example: DO1 Follows DI1 ​

Configuration:

FieldValue
Mode0x0000 (DI follow)
Action0x0001 (close when DI=1)
DO index0x0001
Trigger index0x0001
Parameter 10x00000000
Parameter 20x00000000

Modbus command:

text
01 10 00 80 00 08 10 00 00 00 01 00 01 00 01 00 00 00 00 00 00 00 00 0D FE

6.4 Example: DI1 Triggers a 1-second Pulse on DO1 ​

Configuration:

FieldValue
Mode0x0002 (pulse)
Action0x0001 (close)
DO index0x0001
Trigger index0x0001
Parameter 10x000003E8 (1000 ms)
Parameter 20x00000000

6.5 Example: Close DO1 Daily at 18:00 ​

Configuration:

FieldValue
Mode0x0009 (daily schedule)
Action0x0001 (close)
DO index0x0001
Trigger index0x0000
Parameter 10x0000FD20 (64800 seconds = 18:00)
Parameter 20x00000000

6.6 Example: Close DO1 When DI1 and DI2 Are Both Active (Logic AND) ​

Configuration:

FieldValue
Mode0x000D (logic combination)
Action0x0001 (close)
DO index0x0001
Trigger index0x0000
Parameter 10x00000000 (DO mask)
Parameter 20x00000003 (DI mask: DI1 + DI2)

7. Troubleshooting ​

SymptomCauseSolution
No responseWrong address or baud rateCheck settings and try broadcast address 0
CRC errorWiring issue or interferenceCheck RS485 polarity and add termination resistors
DO does not switchLoad exceeds ratingReduce the load and verify contact ratings
DI always reads 0Wiring errorCheck COM/DI wiring and input voltage

LED Indicators ​

LEDStatusMeaning
POWERSolid onPower is normal
TXFlashingData is being transmitted
RXFlashingData is being received
DI1-DI8OnInput is active
DO1-DO8OnRelay is closed